I hate speculating on anything going on in Russia due to totally not understanding the Russian thinking. This to me looks like a attempt to control a way of moving funds in and out of Russia without being tracked.
Russian thinking, in this case, is very cynical & pragmatic. The West plays around with regulating Bitcoin in ways which leave absolutely no hint of impropriety, surgically targeting pockets of criminality. Sort of like securing your server with "allow: all; deny: x, y, z."
Russia can afford to bypass the dog & pony show of appeasing the "muh freedoms!" brigade,
look at Bitcoin's userbase, note that it's mainly criminal, and ban it.
Old joke: NASA spent millions of dollars developing an 'astronaut pen' that would work in outer space. The Russians used a pencil.